DES MOINES, IOWA – APRIL 17: Anti-gay and pro-life demonstrators with The Society for Truth and Justice protest outside of a campaign event hosted by Democratic presidential candidate and South Bend, Indiana Mayor Pete Buttigieg on April 17, 2019 in Des Moines, Iowa. Buttigieg is on his first visit to the state since announcing that he was officially seeking the Democratic nomination during a rally in South Bend on April 14. | Scott Olson/Getty Images

Graham, son of the late Billy Graham took to Facebook to condemn the harassment.

“Protesters shouting ‘Sodom and Gomorrah’ interrupted mayor and 2020 presidential candidate Pete Buttigieg this week at a rally in Iowa. I don’t agree with heckling anyone,” he wrote.

While on his campaign run in Iowa this week, protesters, including Randall Terry, a Christian activist who founded Operation Rescue, an anti-abortion rights group, shouted the biblical reference, “Sodom and Gomorrah,” which was destroyed by God for their sinful behavior including homosexuality.

Democrat presidential candidate and mayor of South Bend, Indiana, Buttigieg hopes to make history as the first openly gay president in America.

Other Christian leaders have also weighed in to condemn the behavior of the protesters.

“I identify with the fake @PeteButtigieg whipping Jesus. It was MY sins that put Him on the Cross, my sins as well that Jesus died for, and I would have likely yelled “crucify!” But for grace. Singling out Mayor Pete alone for this is horrendous, especially as a political protest,” Southern Baptist Pastor Alan Cross wrote on Twitter.

Christian radio host Carmen LaBerge also weighed in on Twitter. “Misrepresenting Christ is not Christian. Making a farce of the faith is not faithful. Please stop,” she wrote in part.

Buttigieg who was also met with cheers at the campaign rally, tactfully responded to his critics, “The good news is, the condition of my soul is in the hands of God, but the Iowa caucuses are up to you.”